/*
 *  Copyright 2005 The Apache Software Foundation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.apache.ibatis.ibator.internal.util;

import java.util.StringTokenizer;

/**
 * 
 * @author Jeff Butler
 */
public class StringUtility
{
    
    /**
     * Utility class. No instances allowed
     */
    private StringUtility()
    {
        super();
    }
    
    public static boolean stringHasValue(String s)
    {
        return s != null && s.length() > 0;
    }
    
    public static String composeFullyQualifiedTableName(String catalog, String schema, String tableName, char separator)
    {
        StringBuilder sb = new StringBuilder();
        
        if (stringHasValue(catalog))
        {
            sb.append(catalog);
            sb.append(separator);
        }
        
        if (stringHasValue(schema))
        {
            sb.append(schema);
            sb.append(separator);
        }
        else
        {
            if (sb.length() > 0)
            {
                sb.append(separator);
            }
        }
        
        sb.append(tableName);
        
        return sb.toString();
    }
    
    public static boolean stringContainsSpace(String s)
    {
        return s != null && s.indexOf(' ') != -1;
    }
    
    public static String escapeStringForJava(String s)
    {
        StringTokenizer st = new StringTokenizer(s, "\"", true); //$NON-NLS-1$
        StringBuilder sb = new StringBuilder();
        while (st.hasMoreTokens())
        {
            String token = st.nextToken();
            if ("\"".equals(token)) //$NON-NLS-1$
            {
                sb.append("\\\""); //$NON-NLS-1$
            }
            else
            {
                sb.append(token);
            }
        }
        
        return sb.toString();
    }
    
    public static String escapeStringForXml(String s)
    {
        StringTokenizer st = new StringTokenizer(s, "\"", true); //$NON-NLS-1$
        StringBuilder sb = new StringBuilder();
        while (st.hasMoreTokens())
        {
            String token = st.nextToken();
            if ("\"".equals(token)) //$NON-NLS-1$
            {
                sb.append("&quot;"); //$NON-NLS-1$
            }
            else
            {
                sb.append(token);
            }
        }
        
        return sb.toString();
    }
    
    public static boolean isTrue(String s)
    {
        return "true".equalsIgnoreCase(s); //$NON-NLS-1$
    }
    
    public static String escapeStringForIbatis(String s)
    {
        StringTokenizer st = new StringTokenizer(s, "$#", true); //$NON-NLS-1$
        StringBuilder sb = new StringBuilder();
        while (st.hasMoreTokens())
        {
            String token = st.nextToken();
            if ("$".equals(token)) //$NON-NLS-1$
            {
                sb.append("$$"); //$NON-NLS-1$
            }
            else if ("#".equals(token)) //$NON-NLS-1$
            {
                sb.append("##"); //$NON-NLS-1$
            }
            else
            {
                sb.append(token);
            }
        }
        
        return sb.toString();
    }
}
